Three Phase Transformer Calculator

Three Phase Transformer

Three single-phase transformers connected to one another and sharing a magnetic core make up a three-phase transformer. The single phase of the three-phase electrical system is the capacity that each single-phase transformer can handle. Each transformer’s primary and secondary windings are coiled around the core to facilitate effective energy transfer between the primary and secondary sides.

 A three-phase transformer’s principal function is to transmit electrical energy between three-phase power systems while preserving the stability and balance of the system. In order to meet the electrical load and distribution needs of the associated equipment and devices, it steps up or down the voltage levels as necessary. Three-phase transformers also aid in distributing the loads among the three phases, guaranteeing effective use of electrical power and lowering system losses.

Understanding Three Phase Transformer:

Construction: “A three-phase transformer comprises three sets of primary and secondary windings, coiled around a shared magnetic core. The primary windings are wired either in a delta or star arrangement, while the secondary windings are similarly configured.”

Connections: The primary connection configurations for three-phase transformers encompass four variations: delta-delta, delta-star, star-star, and star-delta.

Advantages: “Multiple benefits distinguish three-phase transformers from their single-phase counterparts:”

Higher power handling capacity

Smaller size and weight

Lower cost

Improved efficiency

Types of three-phase transformers:

Step-up transformers: used to increase the voltage of the power

Step-down transformers: used to decrease the voltage of the power

Isolation transformers: used to isolate the power from the primary and secondary sides

Auto-transformers: used to adjust the voltage of the power without changing the frequency.

Safety considerations:Three-phase transformers pose potential dangers if not correctly installed and maintained. Adhering to safety protocols and regulatory standards is crucial when handling such equipment.

Maintenance: Regular upkeep is essential for the safe and efficient operation of three-phase transformers. This maintenance routine encompasses tasks such as inspecting insulation integrity, cleansing the windings, and replacing any deteriorated components.

Troubleshooting: Diagnosing and fixing issues with three-phase transformers can pose challenges, yet various methods and resources exist to aid in troubleshooting and resolving issues effectively.


  • Power Distribution
  • Industrial Applications
  • Commercial Buildings
  • Renewable Energy Systems
  • Railway Electrification

Discover the voltage, kVA, and amps of a transformer by employing our convenient transformer capacity calculator.

Note : Don’t end with comma ( , )

I Want to Calculate
Volt (V)
Kilovolt-amps (kVA)
Amps (A)


\[V = \frac{(k * 1000)}{(A * Ph)}\]
\[A = \frac{(k * 1000)}{(V * Ph)}\]
\[k = \frac{(Ph * V * A)}{( 1000)}\]


  • V = Volt
  • A = Amps
  • k = kVA
  • Ph = 3 phase (√3 = 1.732050808)

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